pwdreader.py 文件源码

def decryptEntryValue(nonce, val):
    cipherkey = unhexlify(nonce)
    iv = val[:12]
    tag = val[12:28]
    cipher = Cipher(algorithms.AES(cipherkey), modes.GCM(iv, tag), backend=default_backend())
    decryptor = cipher.decryptor()
    data = ''
    inputData = val[28:]
    while True:
        block = inputData[:16]
        inputData = inputData[16:]
        if block:
            data = data + decryptor.update(block).decode()
        else:
            break
        # throws exception when the tag is wrong
    data = data + decryptor.finalize().decode()
    return json.loads(data)

# Decrypt give entry nonce